Tool holder



LSZS? G. |vALD| TOOL HOLDER juy 22 v File'd April 20. 1923 Irvs/Erwan, Q lvm@ Patented July 22, i924.

UNI-TED [STATES PNPENL ori-uca.

GIUSEPPE IvAfLDI, or PATEnsoN, NEW .IER-sav. Y

VTo alf w hom t may concern:

Be it known that L Ginsnrrn IvALDn' a subject of the Iing'of Italy. residing'at Paterson, in the county of Passaic and State of'New Jerseya have inventedy certain new and useful Improvements in Tool Holders, of which the following is a speciivicatio/n.

This invention relates to holders in which rotary tools, such as drills, are held. In

the ordinary construction of -such a'holder vice farranged to move longitudinally in the holder itselfand to be projected more or less into Ythe drift-hole by the enteredv tool.' vso that the ejector `instead of the tool will receive the impact of the drift and'soiavoid marring thetool. j But this involves, among other objections, the following :v That "if the ejector becomes badly burred by the drift it can only `be removed from'the holder'with diiiiculty; and that the removable meanusto sec'ureit against falling out when the tool is removed must necessarily be entered/at the periphery of the "holder, where it is vlikely to work out and form a dangerous projection on the holder.

My invention contemplates providing a holder having a socket and a. drift-receiving hole transverse to and communicating with the socket and, in the socket, a removable containerand, in the container7 a driftactuable ejector movable longitudinally of the socket and retained by the container from falling out when the tool is removed.

In the best form of the invention one or all of the following features will also be embodied, to wit: That the container shall form also an auxiliary holder in which the tool shank is actually received. That said container be formed in two sections separable to permit the removal of the ejector therefrom. That said container itself, when operatively contained in the holder socket and adapted as an auxiliary holder, project into the drift-hole so that the container may be subjected to the ejecting action of the drift. And, na'lly, that thev container' Toor Homann.

Application filed April 20, 1923. Serial No. 633,459.A

have means to afford a tween it and the tool.'

In the drawing, Fig. l is a view showing the improved holder in vertical section, with a tool and positivercoupling be* also a drift in operative position therein;

Fig Q is a side elevation, partly in section, of the container, with the ejector and a certain spring in position therein;

Fig. 3 is a sectional view on line 3-3, Fig. 2; and p Fig. 4 is a side elevation of the member g of the container. l i

a is the holder of `usual form, being say the tool-receiving portionof a Vdrill spindle. b designates what is ordinarily the vdrill receiving socketof the holder and c is the drift hole extendingtransverselyv into the holder and communicating with the vSocket` l is the drill or other tool having a tapered shank d land a tang' Z2 at the end thereof formed as usual in cross section ,sub-

era-l facets.V e is the drift.'y j I Following the 'usual` construction the socket b in the present example is shown 'ptapered from the lower" end of theholder ufpward.' In it i's'iittedj'the aforementioned container ywhich has upward-exterior taper conforming with that of the socket b. This container comprises two members f and g constructed as follows: The lower member f has generally the form of a tapering sleeve formed near its upper end with a transverse wall f having a rectangular hole f2 therein of substantially the same -form and size as the cross section of the tang d2. The sleeve is of such thickness that when the tool shank ai is inserted therein the tang d2 may enter the hole f2 so that d and f will be positively locked together against independent rotation. From its upvstantially rectangular or otherwise with latper end downwardly the sleeve f is internally threaded, as at f3.' The member g has its basal portion g` eXteriorly formed to continue the external contour of the member f, while its upper portion g2 is shaped into av tang substantially rectangular in cross section. Member g has a bore g3 extending therethrough and also a counterbore g4 formed therein from its lower end. In addition, it has a-n eXternally threaded depending' extension g5 adapted to be screwed into the upper threaded end of the member The ejector is a pin 7L formed near one end with an integral collar 7L. The ejector is arranged in the bore g3 with its collar L in the counter bore g4' and when the members f and g are assembled as shown in Figs. l and 3 the collar rests on the wall f, being of greater diameter than the wir th ot the hole f2. Preferably the counter bore contains a spiral spring i interposed between its upper end and the collar 7L. In the stated'position ot the ejector its lower end protrudes into the opening f2.

The container when arranged in the socket Z) of the holder has its tang g2 projecting a little into the drift hole c. j (In the present instance the container is assumed to be gripped by the holder so as to rotate therewith as an incident of the mere friction between the exterior of the container and the socket.) When the drill is inserted its tang is received in the hole f2 and elevates the ejector from the position shown in Fig. 2 to that shown in Fig. l. Whenever it is necessary to remove the tool the dritt c is driven in sufiiciently Jfar to depress the ejector, which of course frees the tool from thev container j". If, occasionally, the container is to be removed the drift may be driven in to a further extent than is necesvsary simply to actuate `the ejector, its -mquent removals of the tool may be effected without displacing the containerg/the tool is adapted, when in working position, to hold the ej ector projecting further into the drift hole than the container.

thereby gripping, each other and the container being divided transversely through its tapered portion into two section-s separably screwed together, and Van ejector arranged inand removable from the container on separating the saidsections and movable longitudinally of the socket Aand adapted,

when a tool is entered-into the holder, to be displaced by the tool so a-s to project into the drift-hole 2. In combination, a-tool holder having a socket and a drift-hole .arranged transverse y of and commwurgcating with the socket, a container including an upper section projecting into the drift-hole .to`be engaged directly by the drift and a lower sec tion removably connected to the upper section, and an ejector movable in the upper section back and forth longitudinally of the socket and adapted -to project upwardlyinto the drift-hole`beyond the 'upper section, said upper section and `the ejector 'having coacting means to limit the relatively Yupward movement of the ejector, and said .ejector being removable downwardly from the upper section when the lower section is de tached from the latter but having its downward movement normally limited by the lower section.

In testimony whereof I -afiix my signature. l

yGIUSEEPE IVAIJDI. 

